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Old 01-08-2016, 01:07 PM
Volvo Diesel Volvo Diesel is offline
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Join Date: Feb 2004
Location: Austin, TX
Posts: 266
Quote:
Originally Posted by jcyuhn View Post
Some googling shows that P0778 on the 772.9 transmission is failure of the B5 solenoid. I think you need a new valve body, as the solenoids are not sold individually. IIRC, this is not a DIY repair, as SDS is required to get the car running again.
^This, most likely. You can read about my similar experience here:

'06 E350 722.9 transmission "sticks" in 1st

Hope this is helpful,
-Chris

EDIT: For anyone who reads the linked thread, the car is now at about 94,400 and I have had no additional transmission issues. I had a fluid/filter change done at the dealer for the 91,000 mile service.
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Christopher
'06 Mercedes E350 station wagon (silver/black)
'85 Mercedes 300D (black pearl/palomino)
'85 Mercedes 300SD (smoke silver/burgundy)
'79 Cadillac Sedan DeVille

'05 Toyota Camry (because always running is nice)

'85 Mercedes 300D sold back to orig. owner 8-1-06
'84 Volvo 264GL Diesel, owned 2000-2013

Last edited by Volvo Diesel; 01-08-2016 at 01:10 PM. Reason: additional info added...
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